Hi Aditya,
On "Comet Lake", the answer will also be (unofficially) negative.
You may preferentially focus on the Small Core (Atom) or Hybrid Processors.
Ref:
https://raw.githubusercontent.com/torvalds/linux/master/arch/x86/include/asm/intel-family.h
On 2021/3/3 3:59, Aditya Basu wrote:
Thanks a lot for the information. From what I see, the Atom P series
are server-grade processors.
Would you happen to know if any Desktop/Workstation processors (ex.
10th gen i9) also support this feature?
Specifically, I'm referring to Comet Lake, here --
https://ark.intel.com/content/www/us/en/ark/products/codename/90354/comet-lake.html
Aditya
Aditya
On Mon, Mar 1, 2021 at 8:16 PM Xu, Like <like.xu@xxxxxxxxx> wrote:
On 2021/3/2 2:48, Aditya Basu wrote:
Hi all,
I am a PhD student at the Pennsylvania State University. For my
current project, I am trying to run Intel Processor Trace (PT) inside
a Guest VM. Specifically, I want to run KVM in the "Host-Guest mode"
as stated in the following bug:
https://bugzilla.kernel.org/show_bug.cgi?id=201565
However, I *cannot* find an Intel processor that supports this mode. I
have tried using Intel's i7-7700 and i7-9700k processors. Based on my
findings, the problem seems to be that bit 24 (PT_USE_GPA) of
MSR_IA32_VMX_PROCBASED_CTLS2 (high) is reported as 0 by the processor.
Hence, KVM seems to force pt_mode to 0 (or PT_MODE_HOST).
You may try the Intel Atom® Processor P* Series.
https://ark.intel.com/content/www/us/en/ark/products/series/29035/intel-atom-processor.html?wapkw=Atom#@Server
I would appreciate any pointers that someone might have regarding the
above. Specifically, I want to find an Intel processor that supports
running Intel PT in "Host-Guest mode".
Regards,
Aditya Basu
PhD Student in CSE
Pennsylvania State University
https://www.adityabasu.me/
